--- libpqxx-2.6.9.orig/src/transaction_base.cxx
+++ libpqxx-2.6.9/src/transaction_base.cxx
@@ -18,6 +18,7 @@
  */
 #include "pqxx/compiler-internal.hxx"
 
+#include <cstring>
 #include <stdexcept>
 
 #include "pqxx/connection_base"